To make the answering process easy let's first conjugate ser in its possible forms:
Yo- soy
Tu- eres
ella/ello/usted- es
nostros- somos
ellos/ellas/ustedes-<span> son
</span>So now you just have to identfy the sentence where both the noun/pronoun matches the verb conjugation.
Therefore the best answer would be <span>Clara no es cubana (option 2).
It could not be:
</span>1) "Ellas es muy inteligentes" because Ellas matches son
3) "Nosotros son amigos" because Nosotros matches somos
4) "Yo eres serio" because Yo matches soy<span>
</span>
4. Esquiar
That means skiing. If you would chosen 1, it would mean singing, and you can sing anytime and not only winter. 2, it means riding a bike, and you definitely can't do that in winter. And 3, that would mean swimming, and I'm pretty sure nobody would want to swim when it's freezing cold outside.
Negatively: No, no hay ningun buzon en la plaza bolivar.
Positively: Si, si hay un buzon en la plaza bolivar.
Hope this helps!!! :)
Por favor ser mas especifico en tus preguntas. Siga las pautas de pregunta